On 12/09/2015 08:45 AM, Michael Kerrisk (man-pages) wrote: >>> >> * Explanation of what a protection domain is. >> > >> > A protection domain is a unique view of memory and is represented by the >> > value in the PKRU register. > Out something about this in pkey(7), but explain what you mean by a > "unique view of memory". Let's say there are only two protection keys: 0 and 1. There are two disable bits per protection key (Access and Write Disable), so a two-key PKRU looks like: | PKEY0 | PKEY1 | | AD0 | WD0 | AD1 | WD1 | In this example, there are 16 possible protection domains, one for each possible combination of the 4 rights-disable bits. "Changing a protection domain" would mean changing (setting or clearing) the value of any of those 4 bits. Each unique value of PKRU represents a view of memory, or unique protection domain. -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
